Guitar neck



FIG. 1 is a rear perspective view thereof;

FIG. 2 is a rear elevation view thereof;

FIG. 3 is a front elevation view thereof; and,

FIG. 4 is a right side elevation view thereof, the left side being a mirror image.

The broken lines shown in the figures are for environmental purpose, and form no part of the claimed design. 

CLAIM The ornamental design for a guitar neck, as shown and described. 